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/* *****************************************************************************
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* Created: 12/18/09 02:39:48
* Copyright (c) 2009 Perry L. Hung. All rights reserved.
*
* ****************************************************************************/
/**
* @file ext_interrupts.c
*
* @brief Wiring-like interface for external interrupts
*/
#include "wiring.h"
#include "exti.h"
#include "ext_interrupts.h"
typedef struct ExtiInfo {
uint8_t channel;
uint8_t port;
} ExtiInfo;
static ExtiInfo PIN_TO_EXTI_CHANNEL[NR_MAPLE_PINS] = {
{EXTI3, EXTI_CONFIG_PORTA}, // D0/PA3
{EXTI2, EXTI_CONFIG_PORTA}, // D1/PA2
{EXTI0, EXTI_CONFIG_PORTA}, // D2/PA0
{EXTI1, EXTI_CONFIG_PORTA}, // D3/PA1
{EXTI5, EXTI_CONFIG_PORTB}, // D4/PB5
{EXTI6, EXTI_CONFIG_PORTB}, // D5/PB6
{EXTI8, EXTI_CONFIG_PORTA}, // D6/PA8
{EXTI9, EXTI_CONFIG_PORTA}, // D7/PA9
{EXTI10, EXTI_CONFIG_PORTA}, // D8/PA10
{EXTI7, EXTI_CONFIG_PORTB}, // D9/PB7
{EXTI4, EXTI_CONFIG_PORTA}, // D10/PA4
{EXTI7, EXTI_CONFIG_PORTA}, // D11/PA7
{EXTI6, EXTI_CONFIG_PORTA}, // D12/PA6
{EXTI5, EXTI_CONFIG_PORTA}, // D13/PA5
};
/**
* @brief Attach an interrupt handler to be triggered on a given
* transition on the pin. Runs in interrupt context
*
* @param[in] pin Maple pin number
* @param[in] handler Function to run upon external interrupt trigger.
* @param[in] mode Type of transition to trigger on, eg falling, rising, etc.
*
* @sideeffect Registers a handler
*/
int attachInterrupt(uint8_t pin, voidFuncPtr handler, ExtInterruptTriggerMode mode) {
uint8_t outMode;
/* Parameter checking */
if (pin >= NR_MAPLE_PINS) {
return EXT_INTERRUPT_INVALID_PIN;
}
if (!handler) {
ASSERT(0);
return EXT_INTERRUPT_INVALID_FUNCTION;
}
switch (mode) {
case RISING:
outMode = EXTI_RISING;
break;
case FALLING:
outMode = EXTI_FALLING;
break;
case CHANGE:
outMode = EXTI_RISING_FALLING;
break;
default:
ASSERT(0);
return EXT_INTERRUPT_INVALID_MODE;;
}
exti_attach_interrupt(PIN_TO_EXTI_CHANNEL[pin].channel,
PIN_TO_EXTI_CHANNEL[pin].port,
handler, mode);
return 0;
}
int detachInterrupt(uint8_t pin) {
if (!(pin < NR_MAPLE_PINS)) {
return EXT_INTERRUPT_INVALID_PIN;
}
exti_detach_interrupt(PIN_TO_EXTI_CHANNEL[pin].channel);
}
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